Gandhiji made his first public appearance and speech in India:

At the opening of Banaras Hindu University

The correct answer is Option (3) → At the opening of Banaras Hindu University

Mahatama Gandhi's first major public appearance was at the opening of the Banaras Hindu University (BHU) in February 1916. Among the invitees to this event were the princes and philanthropists whose donations had contributed to the founding of the BHU. Also present were important leaders of the Congress, such as Annie Besant. Compared to these dignitaries, Gandhiji was relatively unknown. He had been invited on account of his work in South Africa, rather than his status within India. Champaran was Gandhiji first satyagraha.